Convulsions or seizures are defined as sudden, uncontrolled bursts of abnormal activity that last from one to three minutes. Signs may include anything from a slight twitch to salivating and foaming at the mouth.

Cataracts are the second leading eye disease in dogs. A normal lens, which sits behind the pupil, is transparent and focuses incoming light on to the retina. The retina sends the image to the brain where vision is perceived.